Wind-borne debris region

A wind-borne debris region is an area, defined by the code from wind speed and distance to the coast, where building openings must be protected against impact from debris carried by high winds.

The reasoning is structural rather than cosmetic. A window broken during a hurricane lets the building pressurize internally, and the resulting pressure difference is what lifts roofs off. Protecting openings keeps the building envelope closed and the pressures manageable.

What compliance requires

Every glazed opening in the region must either be impact-resistant or be protected by an approved shutter system. That includes windows, glass doors, skylights, and garage doors, which are large and frequently overlooked.

The two paths:

• Impact-rated products, tested to withstand a missile impact followed by pressure cycling
• Approved shutters or panels, tested to the same standards and installed per their approval

Where it applies

The region is defined by the code from wind speed contours and proximity to the coast. In Florida it covers a substantial portion of the state, and Miami-Dade and Broward operate under the high-velocity hurricane zone with more demanding requirements again. Coastal areas of other hurricane-exposed states have equivalent provisions.

Documentation

Compliance is shown through product approvals demonstrating that each product is rated for both the impact requirement and the design pressures from the wind load calculation. Both halves are checked, at plan review and again by the inspector in the field.